| Playlist: | Documentary |
| Category: | General |
| Added By: | playman |
| Date Added: | January 14, 2010 |
| Video description: In 1876 Alexander Graham Bell was granted a patent for his telephone. | |
| Rating: |
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| Tags: | call waves sound milestones telephone engineering johann philipp reis alexander graham bell cellphone calling |
| Views: | 123 |




























































































































































































































